摘要:
Isocyanoacetonitrile 1 was synthesized starting from aminoacetonitrile by the Ugi method. The structure and relative energies of 1 were calculated by ab initio methods (MP2/6-31G**) in comparison with malonodinitrile and diisocyano-methane. 1 crystallizes on cooling below -14 degrees C forming a colourless solid. monoclinic, Pn, a = 614.9(2), b = 756.3(1), c = 786.4(3) pm, beta = 98.99(4)degrees, Z = 4, R = 0.054, wR(2) = 0.132, with two molecules representing the asymmetric unit. 1 polymerizes readily at ambient temperature forming a dark-brown almost insoluble solid 2. 1 can be stabilized by coordination to metal fragments. The metal complexes (CO)(5)M(CNCH2CN) (3) (a, M = Cr; b, M = W), CpMn(CO)(2)(CNCH2CN) (4) and fac-(CO)(3)W(CNCH2CN)(3) (5) were synthesized and characterized by spectroscopic methods. The structures of 3a, monoclinic, C2/c, a = 2481.4(7), b = 582.2(2), c = 2053.3(6) pm, beta = 134.57(2)degrees, R-1 = 0.0368, wR(2) = 0.1001, and 4, monoclinic, P2(1)/a, a = 1223.7(2), b = 586.0(1), c = 1446.3(3) pm, beta = 97.81(2)degrees, R-1 = 0.0459, wR(2) = 0.1190, were determined by single crystal X-ray diffraction.